As far as I understand, the inyan of drinking on Purim is to be happy, not funny.
Who says you have to be funny to be happy?
There are many posters here who seem happy, but are clearly not funny, certainly not intentionally.
BTW, I can say that I don’t know of anyone who drove on Purim after drinking enough alchahol that would impair their abilities ( we all had to read the tables in the permit books).
I am not saying it doesn’t happen. Even not on Purim, but I have never observed it, and I have observed much drinking.